From my chats with Messias, Messias Vigario always said, that 60 was their first Vintage and 47 their first Colheita. We might want to include some of them as well as they really are better in quality than the Vintages.

Interesting thoughts, Tom. If you want to complicate your theory a bit, you might take into consideration that the first years/decades the Ports would be opened much more than in the later years. If your average is 4% and your average life expectancy is 80 years for a good year, you might want to ta...